||These WFC3 UVIS superdarks, drk, and CTE corrected superdarks, dkc, will affect all UVIS data taken from November 28th - December 23 2020. Currently, the automated calibration pipeline and Calibration Reference Data System only have WFC3 UVIS drk and dkc reference files up to a USEAFTER date of November 25th 2020. The automated pipeline should now use these reference files to perform dark subtraction on any UVIS datasets obtained between the dates above because they represent the most accurate estimate of the dark current and hot pixels at the time of the science observation. These WFC3 UVIS drk and dkc files were generated using dark exposures from the HST Cycle 28 daily monitoring programs 16394 and 16414. More information regarding the method used to create UVIS dark calibration reference files can be found in WFC3 ISR 2016 08. Additionally, the header of each reference file has a detailed history section outlining the process and provides a list of datasets used to create each file.
||The pivot wavelengths in the imphttab needed to be updated to match the updated synphot tables.
||The ACS WFC bias, dark, CTE dark, and sink files were generated following the ACS WFC anneal on Jan 05, 2021, and should be used to calibrate ACS WFC observations taken between Dec 08, 2020 and Jan 05, 2021.
||The temporal changes and updates delivered in the previous versions of the synphot files in 2020 are all still correct - this redelivery is to allow synphot packages such as pysynphot to properly interpolate values of the throughput between the beginning date MJD 55008 and the current first column in the tables. Further we also updated the pivot wavelengths in the aperture file. Lastly, we want the version numbers of the updated time dependent synphot files to continue to match the non time dependent synphot files so we update the version of those files for redelivery as well.